Valve.



W. V. SMITH.

VALVE. Y APPLICATION rILBD MAn.1Q; -19`2.

Ptntea Aug. 27, 1912.

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Specioation of 'Letters Tatent; Application nIedMarcl/l 16, .1912. Serial No. lha.

To all whom it may concern.

Be it known that l,- Wnmmnr 'VIC/ron SMITH, a citizen of the United 'Stat-es, residing at Schenectady, in the county of Schenectady and State of New York, have invented certain new and useful lmprove i ments in Valves, of whichtlre followingis specification. v My invention relates to improvements in valves, and is intended especially to im roven' the constructionl of piston valves an pistons in certain particulars.

The object ot the invention is the prof -vision of a piston slide valve of this character which will maintain a steam tight jointabout the packing rings; which.` is

durable and eficientl in operation,and aspecial advantage which might be mentioned is the 'facility with which the parts may be vassembled Ior dismantled. inl case of repair, and the rings may be removed and replaced" without the -necessity of taking apart the entire valve.

Another meritorious feature of the invention resides in the construction whereby the valve in its travel is keptv inalineinent with the motion work oftheengine vto which the stern is connected, and the strain taken oil the valve.

@ther advantages and merits will appear hereinafter, and will be readilyunderstood by those skilled in this art.

The invent-ion consists in certain novel lieatures oi' construction and combinations and arrangements of parts as hereinafter described and claimed.

ln the accompanying drawings l have illustrated one example of the physical embodiment of my invention constructe(1 as a piston slide valve according to the best mode I have so tar devised for the practical application ot the principles, but it will of course be understood that the invention may l be embodied in standard pistons for diderent natures of engines, including internal.

combustion engines.

Referring to the drawings, Figure 1 is a view in side elevation of a piston valveembodying my invention, one end (the rear) being shown in section. Fig. 2 is a face view of a split or elastic grooved ring, or U* shaped packing ring. Fig. 3 is a tace view ot' a complementary ribbed ring or 'll'fshaped packing ring, also split and elastic and kadapted tocooperate .with the lll-shaped ring. Yligffl is a Vvertical sectional viewed :the groovcd ring. Fig. 5 is a vertical sec-l tional View ot the bull ring, andFigz iis a vertical sectional View ot the split r-ibbedring. i Y

y inthe preferred embodiment of my infvention as illustrated'in Fig. 1 the piston aslide' valve comprises the front head 1 and of the stem 3, and held together, directly, by @means of the clamping nut/l (dotted lines) in Fig. 1. The heads are also connecte'dby a tubulaimember 5, which incases the stem lloetween the two heads, and is seated at leach end, in an annular recess 6, formed on .a sleeve 7, which projectiey inwardly from cachot the followers 8, .and pins or rivets '9 gsecurethe tube to the sleeves.

EFig. 1 it will be observed that a chamber 1t) `is bored in the outer face of the follower,

.gand a spring 11 is seated therein, which The shoulder 14 of the stern 3 may be drawn, by means of the nut 4, against the sr-ring 11, to clamp the two heads and hold t ein, while the loose tit of the stem within the bore 13 permits a slight play of parts, so that when lining up the valve, the strain is taken ofi the valve and link motion works of the engine. The'spring is provided for the purpose of taking the strain od the valve when in motion, and for taking up the slight play between the stem and bore 13.

Each follower 8 is provided with packing mechanism or rings ofv identical construction, so that the description of one head and its rings-will .apply to both. Referring and at the rear, it will be seen that the folperiorated for the passage of bolts 16, and by means of these bolts the tivo sections 17 and 18 of the cage are held together and to the flange of the follower, nuts 19 being employed for clamping the parts rigidly together.

Each of the cage sections or open rings is formed with an outwardly projecting flange, as 20 and 21, and these flanges prolrear head 2, which are connected by meansA particularly to the head, shown in section, v i

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The followers 8 are each perforated to. accommodate the stern 3, and at the left in" lower is formed with an annular llange 15 vide recessed annular seats for the grooved split, elasticpacking rings 22 and' 23 respectively.

1 Each ygrooved ring 4is provided with 'aV complementary ribbed, split, elastic packing'mr'in as 22." and 23)y and the ribs 24 are adapte to fit within the grooves 25, dowel.l ins 26 in the bull ring 28 and holes 26 27 eing provided to insure close connect-ion.

The bull ring 28, as shown is U-shaped in cross section and is formed with four ra-` dially extending ribs 29, and is located be- `a pair of heads, each comprising a follower tween the pairs of grooved and ribbed packing rings, as usual.

The ports .of the valve mechanism are to receive steam, while' the rear end shows the valve ready to exhaust the steam at the.

ports. l A

From the above description taken in connection with the drawings it will be understood that the paclrin rings will effcctually prevent 'the' escape of steam from the cylinder,V and that the elastic rings as coupled.

in pairs will adjust themselves to continuous contact with the walls of the cylinder I and. to the edge of the ports.

-The followers, which are metallic castings, carry the cages, the latter being bolted directly to the'former., and it will 'be seen that the cage and packing rings may be re- 'moved and replaced with facility and without theaneeessit of removing the piston from the cyli er, v'or 4the stem from the piston, as 'isnecessary many valves now 1n use. Y

ing against said spring, lthe stem being loosely inclosed in the chambered follower. 2. In a piston valve, the combination with having an annular flange, flanged cage vsections., packing rings carried by Said cage sections, and bolts passed 'through said ange and sections, of Aa valve stein, and means for clamping the followers on the stein, and a sleeve surrounding the'stem and holding the followers spaced apart.

3. In a piston valve, the combinationwith a `pair of headsl each comprising a follower having an annular flange, flanged cage sections and packing rings carried thereby, and

bolts locking said flange and 'sections together., of a stem having a shoulder, a recess in one of the followers 'and a spring in,

said recessbearing on said shoulder, and a sleeve surrounding the stem and holding the followers spaced apart'.

Intestimony whereof I affix my signature in presence of twofwitnesses.

' WILLIAM VICTOR SMITH.

VVit'nesses:

JAS. E. MoR'roN, FELIX SoHnvnRMER. 

